package com.ricervcvcer.order.config;

import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.BlockExceptionHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.fastjson.JSON;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//异常处理页面
@Component
public class ExceptionHandlerPage implements BlockExceptionHandler {
    //BlockException  异常接口,包含Sentinel的五个异常
    //  FlowException  限流异常    
    //  DegradeException  降级异常    
    //  ParamFlowException  参数限流异常    
    //  AuthorityException  授权异常    
    //  SystemBlockException  系统负载异常
    @Override
    public void handle(HttpServletRequest request, HttpServletResponse response, BlockException exception) throws Exception {
        response.setContentType("application/json;charset=utf-8");
        ResponseData data = null;
        if (exception instanceof FlowException) {
            data = new ResponseData(-1, "接口被限流了...");
        } else if (exception instanceof DegradeException) {
            data = new ResponseData(-2, "接口被降级了...");
        }
        response.getWriter().write(JSON.toJSONString(data));
    }
}
@Data
@AllArgsConstructor
//全参构造 @NoArgsConstructor//无参构造
class ResponseData {
    private int code;
    private String message;
}